Solar cell



FIG. 1 is a top perspective view of the first embodiment of a solar cell showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a back elevation view thereof;

FIG. 7 is a front elevation view thereof;

FIG. 8 is a top perspective view of the second embodiment of a solar cell showing our new design;

FIG. 9 is a top plan view thereof;

FIG. 10 is a bottom plan view thereof;

FIG. 11 is a right side elevation view thereof;

FIG. 12 is a left side elevation view thereof;

FIG. 13 is a back elevation view thereof; and,

FIG. 14 is a front elevation view thereof.

All elements shown in the FIGS. 1-3, and 8-10 are structural lines on the surface and are flat with the top surface. 

CLAIM The ornamental design for a solar cell, as shown and described. 